I drive my Z no more than 5,000 easy miles a year. When I switch to synthetic after I hit 10,000 miles, I will change the oil only once a year. Each oil change will have no more than 5,000 easily driven miles on it, even though the oil will have been the car for a year. I don't think that's harmful. Am I wrong here? Is the time issue (up to 12 months) a concern?
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